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参数资料
| 型号： | MAX6971AUG+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LINEAR 24-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 62 |
| 恒定电流： | 是 |
| 拓扑： | 线性，高端 |
| 输出数： | 16 |
| 内部驱动器： | 是 |
| 类型 - 主要： | LED 照明显示器，标牌，汽车 |
| 电源电压： | 3 V ~ 5.5 V |
| 输出电压： | 36V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
16-Port, 36V Constant-Current LED Driver
Applications Information
Selecting External Component R SET to Set
LED Output Current
The MAX6971 uses an external resistor, R SET , to set the
LED current for outputs OUT0–OUT15. The minimum
allowed value of R SET is 327.3 Ω , which sets the output
currents to 55mA. The maximum allowed value of R SET
is 5k Ω . The reference value, 360 Ω , sets the output cur-
rents to 50mA. To set a different output current, use the
Overtemperature Cutoff
The MAX6971 contains an internal temperature sensor
that turns off all outputs when the die temperature
exceeds approximately +165°C. The outputs are
enabled again when the die temperature drops below
approximately +140°C. Register contents are not
affected, so when a driver is overdissipating, the exter-
nal symptom is the load LEDs cycling between on and
off as the driver repeatedly overheats and cools, alter-
nately turning the LEDs off and then back on again.
formula:
R SET = 18,000 / I OUT
Power-Supply Considerations
The MAX6971 operates with a chip supply V+, and one
where I OUT is the desired output current in mA.
Computing Power Dissipation
The upper limit for power dissipation (P D ) for the
MAX6971 is determined by the following equation:
P D = (V+ x I+) + (V OUT x DUTY x I OUT x N)
where:
V+ = supply voltage
I+ = operating supply current when sinking I OUT LED
drive current into N outputs
DUTY = PWM duty cycle applied to OE
N = number of MAX6971 outputs driving LEDs at the
same time (maximum is 16)
V OUT = MAX6971 port output voltage when driving load
LED(s)
I OUT = LED drive current programmed by R SET
P D = power dissipation, in mW if currents are in mA
Dissipation example:
I OUT = 20mA, N = 16, DUTY = 1, V OUT = 2V, V+ =
5.25V
P D = (5.25V x 25mA) + (2V x 1 x 20mA x 16) = 0.77W
Thus, for a 24-pin TSSOP package (T JA = 1 / 0.0122 =
+82°C/W from the Absolute Maximum Ratings ), the
maximum allowed ambient temperature T A is given by:
T J(MAX) = T A + (P D x T JA ) = +150°C =
T A + (0.77 x 82°C/W)
so T A = +86°C.
or more LED supplies. Bypass each supply to GND
with a 0.1μF capacitor as close to the MAX6971 as pos-
sible. This is normally adequate for static LED driving.
For multiplex or PWM applications, it is necessary to
add an additional bulk electrolytic capacitor of 4.7μF or
more to each supply for every 4 to 16 MAX6971s. The
necessary capacitance depends on the LED load cur-
rent, PWM switching frequency, and serial-interface
speed. Inadequate V+ decoupling can cause timing
problems, and very noisy LED supplies can affect LED
current regulation.
Chip Information
PROCESS: BiCMOS
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6971AUG+ | 功能描述:LED照明驱动器 16-Port 36V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX6971AUG+T | 功能描述:LED照明驱动器 16-Port 36V Constant Current LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX6971AUG-T | 功能描述:LED显示驱动器 RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX6971EVKIT+ | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX6971 RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX6972ATJ | 制造商:Maxim Integrated Products 功能描述:16-OUTPUT PWM LED DRIVERS FOR MESSA - Rail/Tube |
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